And you know, even though I rather enjoy TOS, I'd still take TFF over any individual episode.
My phaser is set to kill...
Now, I do like TOS a lot, but the films in general are just better for me. TOS is static. The films, even the more flawed ones, move the characters. Kirk, Spock, and McCoy changed more in twelve hours of movies than seventy-nine hours of television.
But that might just be a personal preference.